Nobody will be putting anything out that is under the 14-16nm tech for the next probably 2 years.
Nobody says that they will move to 10nm.
However, consider the following:
BM1382 S3
BM1384 S5
BM1385 S7
..were all 28nm chips, but they were optimized, etc to result in ability to pack more chips in a similar size miner plus chips got to be more efficient.
S3 had 0.77 J/Gh and 32 chips 28nm
S5 had 0.51 J/Gh and 60 chips 28nm
S7 had 0.25 J/Gh and 162 or 135 chips (later versions) 28nm
S9 has 0.1 J/Gh and 189 chips 16nm
S10/11 might be 0.07J/Gh? and 264? chips (14 or 16nm)?